Introducing the Matrix M-Stage HPA-3U and HPA-3B, review to follow!

[omegaorgun]

Can the OP change the title to the official 3A and 3B thread and list the specs/pics on the first post?

 

[omegaorgun]

OPA 1656'S are my favorite, very tight and clean. Burson's are a little looser but wider sounding.

 

[staxstax]

3 years ago I bought the Matrix M-Stage HPA3u
today out of the blue the right channel gives less volume
I tried different cables, headphones and players, the problem remains
(no mods, never opened the case)
Am I the only one?
if you know what it may causes the problem please help

 

[staxstax]

3 years ago I bought the Matrix M-Stage HPA3u
today out of the blue the right channel gives less volume
I tried different cables, headphones and players, the problem remains
(no mods, never opened the case)
Am I the only one?
if you know what it may causes the problem please help

 

[Atgm1]

3 years ago I bought the Matrix M-Stage HPA3u
today out of the blue the right channel gives less volume
I tried different cables, headphones and players, the problem remains
(no mods, never opened the case)
Am I the only one?
if you know what it may causes the problem please help

I had something similar recently. I just unplugged and reconnected the connecting cables and the problem disappeared. Maybe something happened in the socket of the DAC or amplifier?

 

[mikaelmark]

Isn't m-stage a Chinese company and therefore if I purchase direct I would be purchasing from China or am I mistaken? Also tamaudio on Amazon shows the product shipping from China. Where would I buy the product where it wouldn't come from China?

Where do you live? I live in Sweden (northern/west Europe) and has built some LBC (Lovely Black Cube) - similar yours as clone to the Lehmann Black Cube Linear.

Have sold my first buid to a very satisfied head-fi:er in France a couple of years ago. And now I´ve some with very high grade components (24 step Dale volume attenuator, Holco/PRP9372 resistors, Elna Silmic 2/Panasonic FR/Mundorf/Audyn/Teflon caps and Discrete OpAmp etc...)

Have also built a portable model of this, to be carried in a back packer.


Please tell me if youre interesest!

https://www.head-fi.org/threads/bur...-opamps-discussion-and-reviews.854912/page-24

 

[staxstax]

I had something similar recently. I just unplugged and reconnected the connecting cables and the problem disappeared. Maybe something happened in the socket of the DAC or amplifier?

i was wrong about the model, it is the Matrix M-Stage HPA3B

 

[raoultrifan]

3 years ago I bought the Matrix M-Stage HPA3u
today out of the blue the right channel gives less volume
I tried different cables, headphones and players, the problem remains
(no mods, never opened the case)
Am I the only one?
if you know what it may causes the problem please help

You need to provide more info:
- have you tried both RCA and XLR inputs and same happens?
- what about balanced cans, same issue happens?
- have you tried mixing the two opamps between and see what happens?
- anything suspicious inside HPA-3B (maybe some macro pics would help)?

 

[staxstax]

thanks raoultrifan
i tried RCA and XLR with different players the same happens
balanced headphones or not the same,
i thought it may be the pot but when i turn the knob there is no noise or cracking
i will open it to mix the opamps and see if the problem moves to the left channel (i hope)

 

[staxstax]

i mixed the opamps thr problem remains at the same channel

 

[raoultrifan]

Then it might be the gain-adjust circuitry. Could you please adjust the backside gain switch until the volume is identical on both channels? Maybe the gain switch or relay or surrounding circuitry got mad or something.

 

[staxstax]

i dont see a back side gain switch, it is the matrix stage HPA-3B
i also checked inside, (I only removed the cover)
can you tell me please where this switch can be?
i attach a photo
thanks

 

[staxstax]

photo

 

[staxstax]

i can not attach the photo

 

[deafenears]

Bottom left is where the gain switch is at.